It is already well understood causes the global warming.A．whatB．whenC．th

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It is already well understood causes the global warming.

A．what

B．when

C．that

D．how

答案

解析

试题分析：考查连词。句意这让我们很好的了解，什么导致了全球变暖。It做形式主语，真正的主语是后面的主语从句 causes the global warming ，主语从句缺少主语用what“什么”引导，所以选A项。
考点 : 考查连词

举一反三

We should go to the cinema early. __________, there won’t be any tickets left.

A．However

B．Otherwise

C．Besides

D．Instead

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It took me quite a long time to develop a voice, and _______ I have it, I am not going to be silent.

A．now that

B．unless

C．so that

D．although

题型：不详难度：| 查看答案

___________you try to do something beyond what you have already mastered, you will never grow.

A．Since

B．When

C．Though

D．Unless

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I have been advised to arrange for insurance _________ I need medical treatment.

A．so that

B．unless

C．in case

D．though

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--With the country’s pension fund gap becoming wider than ever, retirement age should be postponed immediately.
---Easier said than done. we take all factors into account, we shall be faced with some other social problems.

A．Unless

B．Until

C．When

D．Once

题型：不详难度：| 查看答案